Yes, gluten can be harm to your eyes. According to some researches, gluten can lead to the dark circles under your eyes, because of the Gluten intolerance, which can be related to the immune system. To get rid of the dark circles, you can use some cucumber slices. As we know that cucumber slices have long been used to reduce puffiness and refresh the appearance of skin around the eyes, providing a fast "pick-me-up" for tired and puffy eyes. But on the other hand, they can also be good for the dark circles. So just put a slice over each eye, extending over the darkened area. Remember that you should do this everyday, coupled with lying down for 10-15 minutes. Besides, you should keep relaxing. As we know that relaxing might help remove sources of stress and anxiety that are preventing you from sleeping, eating and resting properly. So that it can relieve the dark circles.